Roll bar explosive cutter mechanism



Nov. 14, 1967 w. H. S USTRICZH E AL 3,352,459

ROLL BAR EXPLOSIVE CUTTER MECHANISM Filed Sept. 12, 1966 2 Sheets-Sheet1 27 52 g I I A 37 40 L 4s 34 32 i 38 24 I l 32 H 5: :I .[L

INVENTOR. WILLIAM H. SUSTRICH GUS FRANCIS Y ATTORALEIS Nov. 14,1967 TRIETAL 3,352,459

I ROLL BAR EXPLOSIVE CUTTER MECHANISM Filed Sept. 12, 1966' '2Sheets-Sheet z rat POWER SUPPLY EVENT CONTROL ARMING SWITCH ml l SWITCHDETONATORS DETONATORS OUTLET CUTTER SEQUENCING SWITCH INVENTOR. WILLIAMH. SUSTRICH GUS FRANCIS ATTORNEYS Patented Nov. 14, 1967 3,352,459 ROLLBAR EXPLOSIVE CUTTER MECHANISM William H. Sustrich, 4022 W. EastmanAve., Denver, Colo. 80236, and Gus Francis, 29 Palo Club Circle, Denver,Colo. 80209 Filed Sept. 12, 1966, Ser. No. 578,640 25 Claims. (Cl.222-85) ABSTRACT OF THE DISCLOSURE The invention relates to apparatusfor draining fluid tanks, such as, wing tanks for aircraft, bysequentially cutting first a drain hole and second an air breathing holein the tank by means of explosive cutters located at different areas onthe tank, the invention residing in an improvement for insuring that theholes are cut in the proper sequence, the improvement being (1) theconstruction of the annular explosive charge of the cutter for the drainhole with a space between its ends so that the cut out portion for thedrain hole is left attached to the tank by an uncut hinge portion, and(2) a roll bar adjacent the hinge portion carrying an actuating meansfor actuating the detonating means for the explosive cutter of the airinlet hole, so that the detonating means for the air inlet cutter can beactuated by the hinge portion contacting the actuating means on the rollbar only after the drain hole has been cut.

This invention relates to a method and apparatus for draining liquidsfrom a container, more particularly, it relates to a method andapparatus for sequentially cutting a liquid outlet hole and an air inlethole in a container by means of explosively actuated cutters.

The invention is specifically directed to apparatus for draining liquidsfrom a tank or container carried underneath an aircraft wing; however,it is by no means limited to this application as it can be used forcutting holes in various type containers, flat work and other material.

Various occasions arise where it is necessary to discharge liquids fromtanks carried beneath the wings of aircraft. For example, in the use ofaircraft in fighting fires or in crop dusting it may be desirable torelease liquid fire retardant material or insecticides from tankscarried under the wings of the aircraft. Certain military applicationsnow require the release of liquids from tanks carried beneath the wingsof military aircraft.

The rapid and effective discharge of liquids from a suspended tankrequires that an air hole be cut in the tank as well as a liquid outlethole in order to provide for effec tice flow of fluid from the outlethole. It is well known that in order for liquid to flow rapidly from theoutlet of a container without breathing, an air inlet hole must beprovided so that air can fill the space occupied by the liquid beingdischarged from the container. Accordingly, any method and apparatusproviding for the effective release or discharge of liquids from asuspended tank must provide for the cutting of both an air inlet holeand a liquid outlet hole in the tank or container.

The apparatus for cutting the holes in the tank must be one whichprovides instantaneous and reliable cutting of the holes upon actuationof the cutting mechanism by the pilot. It has been found that the mostefiective means for cutting the holes is the use of an explosive cuttingmechanism, Such mechanisms generate large forces. It is important thatthe cutter back-up mechanism which is positioned on the outside of thetank not be shattered by the force of the explosion which effectscutting of the holes as shattering, with consequent production ofnumerous fragments of metal, plastic and other material, will result inserious damage to the aircraft.

Among the expedients which may be used for sequential cutting of theliquid outlet hole and the air inlet hole in that order, areelectrically operated timing means to detonate the explosive of thecutters for the two holes in sequence; however, such expedients are notfool-proof or reproducible, and are subject to failure of circuitcomponents and other elements which make them unreliable. One expedientto insure that the explosive for the air inlet hole is not detonateduntil the liquid outlet hole has been cut, is a construction by whichthe activating circuit for the explosive is actuated only by movement ofthe cut out portion for the liquid outlet hole. Such a construction mustpositively insure that movement of the cut out portion actuates thecircuit for activation of the explosive of the air inlet cutter.

Accordingly, it is an object of this invention to provide a method andapparatus for discharging liquids from containers;

It is another object of this invention to provide apparatus forsequentially cutting holes in containers and other objects;

It is another object of this invention to provide apparatus forsequentially cutting holes in containers by means of explosive cuttersoperative to cut a second hole only after a first hole has been cut.

It is a further object of this invention to provide explosively actuatedcutters for cutting holes in containers and other objects, which are notsubject to fragmentation and shattering by the explosive which performsthe cutting operation.

The invention in its broadest sense as applied to cutting holes in acontainer comprises two explosively actuated cutters adapted to beplaced one on the bottom of the tank for cutting the liquid outlet holeand one on the top of the tank for cutting the air inlet hole, incombination with switching means which operates to actuate the cutterfor the air inlet hole only after the liquid outlet hole has been cut.The sequential switching means is actuated by movement of the section ofthe tank cut out to form the liquid outlet hole. The explosive cuttercomprises a heavy metal annulus having an arch shaped, annular groove inits bottom edge facing outwardly with an annular concave explosivecharge positioned in and conforming to the groove with its concavesurface facing outwardly and having a metal lining on its concavesurface, and a detonation train for detonating the explosive charge.

To insure sequential cutting of first the liquid outlet hole and thenthe air inlet hole, the circuit for activating the explosive of the airinlet hole cutter is made actuatable only by movement of the cut outportion of the liquid outlet hole. The explosive charge for the liquidoutlet cutter is circular with a space left between the ends of thecharge, so that the cut out portion is not cut out all the-Way aroundbut is attached to the tank by a hinge portion corresponding to thespace between the ends of the explosive, the result being that the cutout portion swings outwardly on the hinge portion after being cut out. Achord-like roll bar is positioned in the annulus of the explosive cutterin a position corresponding to that of the space between the ends of theexplosive charge. The roll bar insures reproducibility and uniformity ofcutting, and that a hinge portion will be left. It also functions tosupport an actuating element for the activating circuit of the air inlethole cutter which is in the path of the cut out portion so that thecircuit for activating explosive of the inlet cutter will not beactivated until the outlet hole is cut.

In the preferred modification, a bufier layer of non-explosive materialis positioned between the explosive charge and the bottom of the groovein the annulus, the surface of the explosive is in the form of a V andtwo detonators are used for redundancy in detonating the explosivecuttin-g charge. Also, rather than mount the cutters directly on thetank surface it is preferred to mount them on a door or patch plate andsecure the patch plate assemblies over holes in the tank so that holesare cut in the patch plate and the tanks can be reused.

The invention will now be described in conjunction with the accompanyingdrawings wherein like parts are represented by like numerals and inwhich,

FIG. 1 is a schematic showing of a liquid tank or container providedwith patch plate assemblies at its top and bottom'including explosivecutters;

FIG. 2 is a cross-section of the patch plate assembly for the liquidoutlet cutter shown attached to a container wall;

FIG. 3 is a top plan view of the explosive cutter of the patch plateassembly of FIG. 2;

FIG. 4 is a section taken on line -44 of FIG. 3 looking in the directionof the arrows;

FIG. 5 is a crosssection of the patch plate assembly for the air inlethole, including an explosive cutter taken on an angled line which passesthrough a well in the annulus of the cutter containing the detonator,and another section of the annulus, and

FIG. 6 is a schematic showing of the circuitry for sequentiallyactivating the explosive cutters of the liquid outlet hole and the airinlet hole, in that order.

As used throughout this specification and the claims, the expressionpatch plate assembly includes the patch plate and its explosive cutterattached thereto with the cutting charge adjacent the patch plate.

Referring now to FIG. 1, there is shown a tank 10 for suspension fromthe underneath side .of the wing of an aircraft by suspension lugs 12.The tank is for carrying liquids to be discharged While the aircraft isin flight. The liquids, of course, may be poisonous, corrosive, orotherwise deleterious. Lower and upper patch plate assemblies 14 and 16are schematically shown mounted for cutting liquid outlet and air inletholes, respectively. A nozzle device 18 is connected by means of aflexible elbow 20 to mounting adapter 22 which secures the patch plateassembly 14 to the tank 10. The purpose of the nozzle, of course, is tocontrol the stream of liquid leaving the tank.

Reference will now be made to FIGS. 2 and 3 for a description of thepatch plate assembly for cutting the lower or liquid outlet hole in tank10. The patch plate assembly 14 includes patch plate 22 and lowerexplosive cutter 24 which is secured to the patch plate with theexplosive cutting charge adjacent the patch plate as shown. Patch plateassembly 14 is attached to tank wall 26 over hole 27 by means ofcircular adapter 28. The adapter 28 is positioned over explosive cutter24 and the cutter is secured in the adapter by means of adapter ring 30.The assembly of the adapter 28, patch plate 22 and circular gasket 37 isthen secured to tank wall 26 by means of bolts 32 passing throughexternal flange 34 of adapter 28, gasket 37 and patch plate 22, and

threaded into internal circular boss 36 welded to the internal surfaceof lower tank wall 26. For a purpose Which will be described later,chord-like roll bar 38 is mounted in explosive cutter 24 and carriesactuating button 40 for a purpose to be later described. Lead wires forthe actuating button 40 and for the detonators of the explosive train ofcutter 24 are brought into the roll bar and cutter throughcable/connector assembly 42 which passes out through an opening in elbow20.

Reference will now be made to FIGS. 3 and 4 for a detailed descriptionof the explosive cutter 24 of the patch plate assembly 14 for the liquidoutlet hole. The cutter is constructed in the form of an annulus 44which must be made of strong metal, such as, high strength steel inorder to provide a sufiiciently strong back-up for the explosive cuttingcharge to prevent shattering when the explosive charge is detonated.

The annulus 44 is of solid cross-section and is constructed with anannular groove 46 facing outwardly toward the bottom of the annulus. Thegroove is arc-shaped and has no square corners. This shape provides thegreatest strength for the surrounding metal and presents no points ofweakness to promote shattering, such as, corners which would result froma groove of rectangular shape. An annular layer 48 of resin, such as,epoxy resin, referred to hereinafter as a buffer element or layer, ispotted into the bottom of groove 46. The buffer layer 48 may be ofsuitable non-metallic material, such as, nylon, Teflon, or othersuitable plastic. The upper surface of the buffer layer 48 is V-shaped,and V-shaped explosive cutting charge 50 inside metal casing 52 isseated in the V of buffer layer 48. The explosive cutting charge 50 iscircular in shape and is positioned in the groove with its concavesurface facing outwardly as respects the cutter annulus.

The described construction provides for an explosive cutting chargewhich is V-shaped and has over its concave outer surface an annularmetal liner which is the front of casing 52. As is well known, theeffect of the V-shaped cavity is to concentrate the force of theexplosion and localize its effect. When the V-shaped cavity is lined orcovered with a layer of metal the explosion acts to transmit jets ofmolten metal together with jets of gas from the explosion of the chargeso that the object to be cut is subjected to concentrated jets of bothmetal and gas. The explosive used may be TNT, Amatol, RDX and similarexplosive. The metal used for the casing 52 over the explosive charge 50is preferably lead as it can be readily formed into an annulus, but themetal used is not restricted to lead.

The cutting charge of the V-shaped annulus of explosive covered withmetal sheath or casing 52 is made by filling a lead cylinder withexplosive, sealing it at both ends and rolling the filled cylinder on. aV-shaped die progressively until the desired shape is obtained and untilthe required amount of explosive per length is obtained. This isconventional practice.

The bufier layer 48 partially surrounds the metal sheath 52 enclosingthe cutting charge 50 as shown. The purpose of this is to buffer theexplosive force to prevent shattering of the walls of the groove and todirect the explosive force outwardly. The ends of the metal casing 52terminate below the edge surface of the annulus 44 as shown to providethe proper standoif distance for the cutting charge, in accordance withWell known practices in the explosives art.

The buffer element 48 plays an important part in this invention as itinsures reliability in the operation of the device and aids materiallyin controlling the direction of force resulting from detonation of theexplosive charge 50. It serves to buffer the force of the explosion ofthe explosive cutting charge and prevent shattering of the back-upannulus.

It is to be noted from FIG. 3 that the circular explosive cutting charge50 does not extend through 360" so that a space is left between its ends54 and 56, and that roll bar 38 is positioned over this space. Thepurpose of this construction is to insure that the portion cut out bythe explosive cutter remains attached to the patch plate or tank by ahinge portion. Detonators 58 are located adjacent the ends 54 and 56,respectively, of the annular explosive cutting charge 50. Electricallead wires extend out of the cutter through cable/connector assembly 42.The detonators 58 are conventional and operate to build up a detonationwave to initiate the explosive cutting charge 50 by end initiation.

Although the patch plate assembly described immediately above has beenidentified as one for cutting the lower or liquid outlet hole, it canalso be used for cutting the upper or air inlet hole. In this latterapplication, of course, the actuation element 40 and associatedcircuitry would be superfluous.

A patch plate assembly for the upper or air inlet hole, as shown in FIG.5, comprises patch plate 62 and upper explosive cutter 64 having itsedge face secured to the patch plate as shown. The explosive cutter 64is provided with an external annular flange portion 66 provided withvertically extending bolt holes 68. Patch plate assembly 16 is attachedto upper container wall 70 over tank hole 71 by means of threaded bolts72 passing through holes 68, gasket 75 and patch plate 62 and threadedlysecured in internal annular tank boss 74. In this modification of theexplosive cutter for the patch plate assembly for the air inlet hole,detonators 76 are positioned in wells 80, 180 apart, only one beingshown. The explosive charge extends through 360 and two detonators areused for the purpose of redundancy. The explosive of the detonators maybe lead azide or similar explosive. The lead-in wires 86 are encased inplastic 88 as shown.

The construction of annular groove 46, butter layer 48, explosive charge50 and metal casing 52 in the upper explosive cutter is the same as thatfor the lower explosive cutter and will not be repeated. Correspondingelements of the two structures are indicated by corresponding numerals.

In FIG. 6 there is shown a schematic diagram of the circuitry connectingthe event control switch with the circuitry for activating thedetonators for the liquid outlet hole, and the circuitry by which thedetonators for the air inlet hole are activated upon activation of thedetonators for the liquid outlet hole and the consequent cutting of thetank portion to make the liquid outlet hole and the movement of thisportion.

The operation of the above-described device will now be described. Withthe upper and lower patch plate assemblies in position over the upperand lower holes in the tank, respectively, the event control switch isoperated by the pilot or other personnel to activate the detonators ofthe lower explosive cutter 24 to detonate the explosive cutting charge.The efiect of the detonation of the explosive cutter is to cut outportion 90 of the patch plate. As will be described later, this portionfirst moves inwardly against the incompressible liquid in the tank andthen moves outwardly as shown in FIG. 2. Due to the fact that a space isleft between the ends 54 and 56 of the circular cutting charge 50, theportion'of the patch plate located adjacent the space between the ends54 and 56 will not be cut out so that the portion 90 remains connectedto the patch plate by a hinge portion. The cut out portion 90 willcontact and depress actuation button 40 as it travels outwardly aroundthe roll bar 38. The effect of the roll bar is to insure that theportion 90 is not cut completely away from the patch plate and toprovide for uniform tearing of the portion 90 along the edges of thehinge section in the direction of the center of the cut out portion.

As shown in FIG. 6 the outlet cutter sequencing switch or button 40actuates the circuitry to activate the detonators of the upper explosivecutter for the air inlet hole which functions in the same manner to cuta hole in the patch plate 62 for the air inlet hole as does theexplosive cutter 24 for the liquid outlet hole.

The described construction provides for sequential actuation of thelower explosive cutter for the fluid outlet hole and the upper explosivecutter for the air inlet hole, in that order. It will be seen that thefiring circuit which activates the detonators for the upper explosivecutter for the air inlet hole can only be actuated by movement of cutout portion 90 for the liquid outlet hole after it has been cut out.

As shown in FIG. 6, the operation of the circuit to provide sequentialactuation of the explosive cutters in the two patch plate assemblies isas follows: The circuit is shown in the safe condition with button 40 inits out- Ward position (normally closed). So long as the current flowsthrough the sequencing switch of the liquid outlet cutter (afterarming), the lockout relay will be activated to cut off the firingcircuit to the air inlet cutter. When the event control switch is closedby the pilot or other personnel to admit current to the detonators ofthe outlet cutter and actuate the explosive cutter of the patch platefor the liquid outlet hole, the switch 40 will be actuated by theoutward movement of the cut out portion 90 of the patch plate 22,cutting off current to the relay and thus permitting current to reachthe detonators 84 of the air inlet cutter. This construction andoperation insures sequential actuation of detonators 58 and 84 with theresult of sequential cutting of the lower liquid outlet hole in thebottom of the tank and the upper inlet hole in the top of the tank inthat order.

Experimentation has proved that the cut out portion 90 for the liquidoutlet hole moves outwardly rather than inwardly after the explosion andthe explanation is as follows: When the explosive of the cutter isdetonated a pressure is created at the face of the liquid which forcesthe cut out portion outwardly since liquid is incompressible. The sameeffect is not achieved with the small cutter, as by the time it issequentially initiated some liquid has left the container and the cutout portion will move inwardly.

The invention has been described by its application to a containermounted on an airplane; however, it is not limited to this applicationas it can be used in any application where sequential cutting isrequired. The invention has been illustrated with the use of twodetonators in the explosive cutters, but it is not limited to such useas one or more detonators may be used, two detonators being preferredfor purposes of redundancy. The invention is not restricted to the useof the non-metallic buffer element in the explosive cutter, but the useof this element is preferred. In the claims, when the cutters arereferred to as being located on the container or tank, this languageincludes location of the cutters either on the patch plate or on thetank itself. The firing circuit illustrated and described is, of course,conventional and optional as other conventional firing circuits may beused.

The invention includes one or more explosive cutters, including a rollbar, with or without patch plates, and with or without adapters. It alsoincludes the combination of one or more explosive cutters including aroll bar, with or without patch plates, in cooperative relationship withone or more patch assemblies, with or without roll bars or adapters.

It is, therefore, to be understood that various modifications andchanges may be made in the constructionand arrangement of parts of thepresent invention without departing from the spirit and scope thereof asdefined by the appended claims. Insofaras these changes andmodifications are within the purview of the annexed claims, they are tobe considered a part of this invention.

What is claimed is:

1. Apparatus for rapidly voiding containers of fluids comprising: atleast a first explosive cutter to be located at a first position on acontainer for cutting out a first portion thereof; activating means forsaid first explosive cutter; at least a second explosive cutter to belocated at a second position on said container for cutting out a secondportion thereof; activating means for said second explosive cutter; atleast one of said explosive cutters operative to partially cut out itsrespective portion to leave the portion attached to said container by ahinge portion; and actuating means operative by movement of saidrespective cut out portion for actuating the activating means for theother explosive cutter.

2. The apparatus of claim 1 in which at least one of said explosivecutters includes an explosive cutting charge and a space exists betweenthe ends of said explosive cutting charge.

3. The apparatus of claim 1 in which roll bar means is mounted in atleast one of said explosive cutters.

4. The apparatus of claim 2 in which roll .bar means is mounted in atleast one of said explosive cutters at a position corresponding to thelocation of said space.

5. The apparatus of claim 4 in which said roll bar means carriesactuation means for activating the other explosive cutter.

6. The apparatus of claim 1 in which at least one of said explosivecutters is mounted on a patch plate with the cutting charge adjacent thepatch plate.

7. The apparatus of claim 6 in which an adapter is associated with atleast one of said patch plates for mounting the patch plate on thecontainer wall.

8. The apparatus of claim 6 in which at least one of said explosivecutters includes an explosive cutting charge and a space exists betweenthe ends of said explosive cutting charge.

9. The apparatus of claim 6 in which roll bar means is mounted in atleast one of said explosive cutters.

10. The apparatus of claim 9 in which said roll bar means carriesactuating means for activating the other explosive cutter.

11. The apparatus of claim 8 in which roll bar means is mounted in atleast one of said explosive cutters at a position corresponding to saidspace.

12. Apparatus for sequentially cutting holes in a container comprising:a first explosive cutter to be located at a first position on acontainer for partially cutting out a first portion thereof to leavesaid first portion attached to said container by a hinge portion; saidfirst explosive cutter being in the form of an annulus incorporating anexplosive cutting charge with a space between the ends of the cuttingcharge and having a roll bar mounted therein at a position correspondingto that of said space; activating means for said first explosive cutter;a second explosive cutter to be located at a second position on saidcontainer for cutting out a portion thereof; activating means for saidsecond explosive cutter; and actuating means operative by movement ofsaid first cut out portion for actuating the activating means of saidsecond explosive cutter.

13. The apparatus of claim 12 in combination with a container and theexplosive cutters being located on said container.

14. The apparatus of claim 12 including a patch plate attached to atleast one of said explosive cutters adjacent the explosive cuttingcharge of the cutter.

15. The apparatus of claim 14 in combination with a container and thepatch plate being located on the container.

16. The apparatus of claim 12 in which said second explosive cutter isin the form of an annulus incorporating an explosive cutting charge witha space between its ends.

17. The apparatus of claim 15 in which a roll bar is positioned in saidsecond explosive cutter at a position corresponding to that of saidspace.

18. The apparatus of claim 1 in combination with a container and theexplosive cutters being located on the container.

19. A patch plate assembly for mounting on an element to cut a holetherein comprising: a patch plate; an explosive cutter including a heavymetal annulus having an annular groove in its bottom edge facingoutwardly; a concave explosive cutting charge positioned in said groovewith a space between the ends of the explosive charge and with itsconcave surface facing out wardly; a concave metal lining on saidconcave surface conforming thereto; said explosive cutter being mountedon said patch plate with the cutting charge of the cutter adjacent thepatch plate; said explosive cutter being operative to cut out a portionof said patch plate leaving the cut-out portion of the patch plateattached thereto by a hinge portion; and activating means for saidexplosive cutter including at least one detonation train for detonatingsaid explosive charge.

20. The assembly of claim 19. in which roll bar means are positionedinside said annulus at a position corresponding to that of said space.

21. A patch plate assembly for mounting on an element to cut a holetherein comprising: a patch plate; an explosive cutter including a heavymetal annulus having an annular groove in its bottom edge facingoutwardly; an annular concave explosive cutting charge positioned insaid groove with its concave surface facing outwardly; a concave metallining on said concave surface conforming thereto; an annular back-uplayer of non-metallic material positioned between the bottom of saidannular groove and said explosive charge; said explosive cutter beingmounted on said patch plate with the cutting charge of the cutteradjacent the patch plate; and activating means for said explosive cutterincluding at least one detonation train for detonating said explosivecharge.

22. Apparatus for cutting a hole in an element and leaving the cut-outportion attached to the element comprising: an explosive cutterincluding a heavy metal annulus having an annular groove in its bottomedge facing outwardly; a concave explosive cutting charge positioned insaid groove with a space between the ends of the explosive charge andwith its concave surface facing outwardly; a concave metal lining onsaid concave surface conforming thereto; activating means for saidexplosive cutter; said explosive cutter constructed to be mounted onsaid element with the cutting charge of the cutter adjacent the elementand being operative to cut out a portion of said element leaving thecut-out portion of the element attached thereto by a hinge portion.

23. The apparatus defined in claim 22 including a means positionedinside said annulus at a position corresponding to that of said spacefor insuring that said hinge portion will be left between said cut-outportion and said element.

24. The apparatus defined in claim 22 for cutting a hole in an elementand sequentially actuating associated apparatus by movement of thecut-out portion of the element and including:

an actuating means for said associated apparatus, said actuating meansbeing operative in response to motion of said cut-out portion to actuatesa1d associated apparatus whereby said associated apparatus issequentially actuated by movement of said cut-out portion after it hasbeen cut out.

25. Apparatus as defined in claim 24 including a means positioned insidesaid annulus at a position corresponding to that of said space forinsuring that said hinge portion will be left between said cut-outportion and said element.

References Cited UNITED STATES PATENTS 2,408,774 10/ 1946 Goddard et a1222-81 X 2,474,826 7/1949 Cantlin 222-5 X 2,989,381 6/1961 Musser 222-5X 3,191,533 6/1965 Hopson 222-5 X SAMUEL F, COLEMAN Primary Examiner.

1. APPARATUS FOR RAPIDLY VOIDING CONTAINERS OF FLUIDS COMPRISING: ATLEAST A FRIST EXPLOSIVE CUTTER TO BE LOCATED AT A FIRST POSITION ON ACONTAINER FOR CUTTING OUT A FIRST PORTION THEREOF; ACTIVATING MEANS FORSAID FIRST EXPLOSIVE CUTTER; AT LEAST A SECOND EXPLOSIVE CUTTER TO BELOCATED AT A SECOND POSITION ON SAID CONTAINER FOR CUTTING OUT A SECONDPORTION THEREOF; ACTIVATING MEANS FOR SAID SECOND EXPLOSIVE CUTTER; ATLEAST ONE OF SAID EXPLOSIVE CUTTERS OPERATIVE TO PARTIALLY CUT OUT ITSRESPECTIVE PORTION TO LEAVE THE PORTION ATTACHED TO SAID CONTAINER BY AHINGE PORTION; AND ACTUATING MEANS OPERATIVE BY MOVEMENT OF SAIDRESPECTIVE CUT OUT PORTION FOR ACTUATING THE ACTIVATING MEANS FOR THEOTHER EXPLOSIVE CUTTER.